Provide indicating scale for each pen and scale legend markings. Provide a
12 month supply of charts and ink for each instrument miniature pen strip
chart recorder.
2.12.4.10
Annunciators
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NOTE: Alarm sequence shall be the following.
Status
Visual
Audible
Normal
Off
Off
Alert
Fast Flash
On
Acknowledge
On
Off
Return to Normal
Slow Flash
Off
Return before Acknowledge Slow Flash
Off
Acknowledge (Reset)
Off
Off
Test
On
Off
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Annunciator shall consist of remote logic rack and separate lamp box
assemblies for control room applications, and integral logic, terminal
blocks, and lamp box assemblies for local control panels. Mount the remote
logic racks for the system panelboard annunciator in the system cabinets.
Provide prefabricated display cables to connect the remote logic with lamp
box assemblies mounted in the panelboard. Equipment shall be constructed
of the highest quality solid-state electronics, factory-tested and burned
in. Trouble contact circuitry shall meet IEEE C37.90.1 Surge Withstand
Capability Test. Provide repeat contacts for each window wired to
terminals. Equipment shall be powered from the Government's 120-volt AC
station service source. Arrange power supplies, circuit breakers, and
input terminal blocks in groups to permit servicing single sections of the
annunciator system without disabling the entire system. Alarm windows
shall be full 50 by 80 mm 2 by 3 inch nominal size. Cable connectors to
lamp box assemblies shall be right-angle type to allow rear connection and
cable routing from below. Terminal blocks in equipment cabinets shall be
slide-link type. Provide terminal marking strips. Alarm audibles for the
annunciator systems shall be electronic tone generators with variable pitch
and volume controls.
2.12.5
Temperature Monitor
Temperature monitor shall scan thermocouple inputs, monitor critical
process conditions, and record temperature in degrees C degrees F and point
number upon alarm or operator demand. Scanning shall be continuous;
recording shall be automatic for each alarm detected. Input point number,
process value, and alarm condition shall be printed on a strip recorder.
Front panel controls shall enable the operator to select scanning rate,
continuous scanning, single point or group scanning, and print-on-alarm or
print-on-demand. A digital display shall present point number and value
for visual monitoring of any or all selected points. In addition to
critical process temperatures such as spray dryer and fabric filter
baghouse inlet and outlet temperatures, inputs shall include bearing
thermocouples and motor RTDs (one per motor). Instrument calibration
accuracy shall be one half degree C one degree F, or better, throughout the
temperature range of 18 to 149 degrees C zero to 300 degrees F and one
percent full scale for process variables. Calibration stability shall be
within one half degree C one degree F for six months with no adjustment,
and equivalent value for process variables. Scanning rate of 6 points per
SECTION 15864N
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